Lock mechanism



Feb. 1, 1949. E, M, NAVARRO 2,460,709

LOCK MECHANISM Filed Feb. 25', 1947 V l y l Patented Feb. l, 1949 UNITED y S TAT 4L-" ATENT 4OFFICE LUCK MECHANIS-M 'Eugene M. Navarro, New York, N. Y.

Application February 25, 1947, 'Serial No. 730,765

(ci. 7c- 369) 2 Claims.

1 My invention is an improvementl in locks; particularly a lock With a rotatable barrel carrying tumblers, and having a slot for the `insertion of a key to engage and retractthe tumblers when the barrel Iis to be rotated.

An important object of the invention is to provide a tumbler lock casing which is to be mounted in a door `or `other closure member equipped with the lock, and be engaged by the tumblers to hold the barrel fast; the lock having an additional tumblergand the interior `of the casing being so shaped that said additional tumbler Will retain the barrel in the lcasing but 'allow it to rotate as required; said additional tumbler `also being so mounted that it can be moved to release the barrel; thus enabling the latter to be mounted in thecasing-and extracted at will.

The nature and advantages of the improvement are made plain in the following description and the novel features are defined in the appended claims. I do not wish, however, to be restricted to the exact structure disclosed herein, but reserve theright to make changes in details of shape, size and arrangement of parts Without `devi'ating from the principle of the invention or omitting any of the features in which the invention resides. v

In the drawings:

Figure 1 is a front view of a lock comprising a tumbler barrel and casing according to this invention.

Figure 2 is a longitudinal section on line 2 2 of Figure 1.

Figure 3 is a rear View.

Figures 4, 5, 6 and 7 are cross sections onlines 4 4, 5 5, 6 6, and 1 1 respectively of Figure 2.

Figure 3 is a front elevation of the casing of the lock, Without the tumbler barrel therein.

Figures 9 and 10 are sections on lines 9 9 and ID I Il respectively of Figure 8.

Figure 11 is a side view of the tumbler barrel of the lock,

Figure 12 is a section similar to Figure 2 showing the complete lock with a key inserted into it.

Figure 13 is a cross section on line I3 I3 of Figure 12; and

Figure 14 is a perspective view of the bolt-turning plug rotatably mounted at the inner end of the casing and connected to the key or tumbler barrel of the lock.

The casing I of the lock has the shape of a hollow cylinder open in front for the insertion of the rotatable tumbler barrel 2,` andhaving at the opposite end, which is the inner end with respect to the door or the like carrying it, a rotatable plug 3, with an outside projection 4. This projection is coupled to the bolt, not shown, t move the latter in the usual manner When the barrel is operated to turn the plug 3. This plug has a reduced shouldered end that fits against an internal l"shoulder B in the adjacent end of the casing .I. `The `plug has a transverse recessA 1, terminating in deeper cavity 8 at one'extremity, in the face presented to the barrel 2. The inner end of the barrel Ahas aitransverse projection-8 and stud I0 that t into the'recess 'I and cavity 'B` respectively, when the parts are assembled. The barrel and .pl-ug are` thus connected and when the barrel isrotated bya key inserted into .the slot I I, the plug is actuated.

The barrel carries several tumblerslZ, mounted in transverserecesses I3. The barrel has a iiange at its outer end presenting aniinsideshoulder i4 which abuts the ends ofseveral longitudinal `ribs I5'of equal vdepth and width in the casing I; the bo'dy of the barrel being ofreduced -diameteradjacent these ribs, and the latter being separated by`l`ongitu`dinal grooves IGlinto one of whiclrthe tumblers project to hold the barrel `2 `against movement. When a key in the slot II retracts `Vthe tumblers from oneo'f the grooves to clear the ribs, the barrel 2 can be turned, The tumblers l2 for preventing rotation of the barrel each have a projection I7 at one sideto engage a shoulder I8 in the recess I3 and limit the outward movement ofthe tumbler into the groove'l See Figure 4. 'On the opposite side eachtumblerhas a shoulder I9 engaged by a spring 2U ina boreuZI, openal'ong the side tothe tumbler recess I3. The tumblers are flat and can usually be inserted'into the recesses or slots I3, afterthe springs I9 are in place, by bending or `springing .them a little along the middle line to make the projections Il clear the shoulders I8; and they can be made resilient enough toreturn to a fiat shape when i-n proper'p'osition.

'Each of the tumblers -l2 `has` an elongated lon-` gitudinally extending opening'22 in line with the key slot II. When no key is inserted in the-slot the springs 20 will project the tumblers out `of the barrel '2 as far as the projections I"I and shoulders 'I8 will permit, into the groove I6 which receives the tumblers. In `this'position the barrel cannot be turned because of the ribs I5 at either side of this groove.

The casing I2 has v`ari-inside circular-groove'23 nearV the shoulder 5, and in `addition Ato the tumblers I2 which secure thebarrel against turning, the barrel-2 carries a tumbler 24 in a trans-- verse slot 25. See Figures 5, 9 and 13. This tumbler Ahas a reduced outer extremity v2li which projects into the circular slot 23. Saidtumbler l24 has the form of `a hook with approximately the outline offa C, one end 21 of which extendsacross the key slot II inthe barrel and projects into a slot-28 at one side of the recess 25 in the barrel 2. The opposite portion 29 from which the reduced extremity 26 projects is larger and also extends across thekeyslot II and terminates in a point 30 which is engaged by a spring 3l in a socket 32 at the side of the recess 25 in the key barrel 2. This tumbler 24 is not `controlled by the key which operates the other tumblers and as long as the end 26 remains in the groove 23 the barrel can be turned/When a key operatesY and pushes back the tumblers I2 to clear the ribs I5, but this barrel cannot be pulled out. The shoulders 33 at each side of the reduced end 26 are provided so that when the barrel 2 is inserted into the casing I these shoulders will slide upon the inclined portions 34 at the ends of two of the ribs I5. The tumbler 24 will thus be forced back into the key barrel until the latter is inserted into the casing I far enough for the tumbler 24 to lie in the same transverse plane as the groove 23. The spring 3| then projects the tumbler 24 so that the end 26 enters the groove 23 and holds the keybarrel inside of the casing I but permits it to be rotated whenever the boltunited to the projection 4 is to be operated.

The casing I will usually be mounted in the door or the like in such position that when the tumblers I2 are held fast between two of the ribs I5, the key slot II will be vertical andthe tumblers I2 will project, when not retracted by 'the`key, into the groove I6 which is lowermost. In this position the two ribs I5 which have the inclined ends 34 will be in the lower half of the casing andthe other two willv be in the upper half; and the plug 3 will be as indicated in Figure '7 and-the stud I0 will be in line with one of the ribs I5 in the upper half of the casing I, as shown in Figure 6.' When the key 35 is inserted into the lock, the tumblers I2 vare retracted from the n 'groove I6 to clear the two lowermost ribs I5, and

then the barrel 2 can be turned through a short arc,l say to the left with reference to Figures '4 and 5. The bolt connected to the projection 4 is thus pulled back, and when the bolt is to be projected the key is turned in the opposite direction and then pulled out to allow the tumblers I2 to be forced once more by their springs 20 into the lowerrnost groove I6. After the barrel/2 has been moved'far enough to retract the bolt, the tumblers I2 will, if the key is pulled out, project into the groove VI6 at the left side of the casing I, as presented in Figure 4. vWhen the barrel 2 has its proper position in the casing I, thestud III enters the cavity 8, and the projection 9 ts in the transverse recess 1 of the plug 3. The latter has a slot 36 which is engaged by a stud 31 in the casing I to limit ythe degree of "rotation through which the plug can be turned by the. barrel 2, and the casing I may have a sight opening 38 in line with the recess 1 when the plug- 3 is at one end of its movement. When the casing is in place, the aperture 38 isA at the point shown in Figure 1, and the unlocking rotation of the barrel proceeds till the lower end ofthe slot 36 strikes against the stop 31. The key slot I I has moved through a quarter of a turn and is hori` zontal inthe casing I.l j

' The barrel 2 can be withdrawn from the casing anytime by first getting the barrel 2 in position to have the slot II vertical, using the key 35 if necessary; and the lower end of the slot 36 of the plug 3 abuts the stop 31. All of the tumblers I2 are now in line with the lowermost groove I6 in the casing. The key 35 is now pulled out and another key is inserted to keep the tumblers I2 readjacent inner corners of the two lower ribs I5, the lowermost groove I6 between them communicating freely at its inner end with the groove 23. See Figure 9. The three other grooves I6 are closed at their inner endsV by ridges 39 between the ribs I5, these ridges helping to form the front Wall of the groove 23. To reinsert the barrel 2, the said other key is again inserted into thel slot and the barrel is put back into the casing with the latter in such position that the shoulders 33 at each side of the end 26 of the tumbler 24 are about in line with the bevelled ends 34 of the two lower ribs I5.- The barrel can then be easily replaced in the casing I because the inclined ends 34 give enough clearance for the tumbler 24 to be pushed in far enough to slide back along these ribs until the slot 23 is reached. The plug is rst turned so as to make the recess 1 and the cavity 8 in the plug 3 register with the projection 9 and stud I0 respectively of the barrel 2. Hence when the barrel is fully in and the key pulled out, the tumbler 24 snaps into the grooved slot 23, the barrel 2 and the plug 3 will again be in connected relation.

A lock of the above description is Very useful for holders in which full bottles of milk are designed to be placed and secured on the exterior of a dwelling or the like between the time of delivery and the hour when the occupant needs the milk and takes possession'of the bottle. But obviously the lock can be employed on doors, closets, lids of chests and strong boxes, orl in any other construction for which a lock is required.

Having described my invention, what I believe to be new is:

Y l. A lock comprising a casing having separated longitudinal ribs therein, a barrel therein having tumbers to project between some of said ribs and engage the casing and prevent rotation of the barrel till said tumblers are retracted, the casing having a circular slot on its interior adjacent the Vinner ends of said ribs, and antadditional tumbler to engagethe` slot to permit the barrel to be turned in the casing while holdingiit against withdrawal therefrom, all of said ribs being united at their inner ends to provide one wall of said slot, the latter having an entrance opening tracted and to retract the tumbler 24 and free it between two of said ribs, which are. bevelled at their forward ends, and a rotatable plug in said casingon the other side of said slot, said plug having a cavity and a transverse recess and the inner-end of said barrel a stud and a projection to enter same respectively, the plug also having a circular groove.` andthe casing a stop entering the groove to allow limited rotation ofthe plug.

2. The lock according to claim 1 in which the additional tumbler is widerthan the spaces bee tween said ribs and has shoulders to engage the beveled forward ends of lsaid ribs when the barrel is inserted in the casing, vsaid additional tumbler then being retracted'by the ribs until it reaches said circular-slot.l

EUGENE M. NAVARRO.

REFERENCES CITED The followingjreferences are of record in the le of this patent:

UNITED VsTA'ITsk PATENTS Falk Feb. 12, 1935 

